Refactor container build and installation pipeline to use configurable Makefile parameters (e.g. DISTROS, base images) and propagate them through all build, install, and test scripts

scripts/docker/entry.sh

@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo "[docker] Starting package-manager container"
+
+# Distro-Info nur für Logging
+if [[ -f /etc/os-release ]]; then
+  # shellcheck disable=SC1091
+  . /etc/os-release
+  echo "[docker] Detected distro: ${ID:-unknown} (like: ${ID_LIKE:-})"
+fi
+
+# Wir arbeiten immer aus /src (vom Host gemountet)
+echo "[docker] Using /src as working directory"
+cd /src
+
+# ------------------------------------------------------------
+# DEV-Mode: aus dem aktuellen /src heraus Paket bauen/installieren
+# ------------------------------------------------------------
+if [[ "${PKGMGR_DEV:-0}" == "1" ]]; then
+  echo "[docker] DEV mode enabled (PKGMGR_DEV=1)"
+  echo "[docker] Rebuilding package-manager from /src via scripts/installation/run-package.sh..."
+
+  if [[ -x scripts/installation/run-package.sh ]]; then
+    bash scripts/installation/run-package.sh
+  else
+    echo "[docker] ERROR: scripts/installation/run-package.sh not found or not executable"
+    exit 1
+  fi
+fi
+
+# ------------------------------------------------------------
+# Hand-off zu pkgmgr / beliebigem Kommando
+# ------------------------------------------------------------
+if [[ $# -eq 0 ]]; then
+  echo "[docker] No arguments provided. Showing pkgmgr help..."
+  exec pkgmgr --help
+else
+  echo "[docker] Executing command: $*"
+  exec "$@"
+fi